STEEL SHEET EXCELLENT IN IMPACT ABSORPTIVITY AFTER NITRIDING TREATMENT, HIGH STRENGTH PRESS-FORMED ARTICLE EXCELLENT IN IMPACT ABSORPTIVITY, AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To provide a steel sheet most suitable for producing a high strength press-formed article excellent in impact absorptivity with high dimensional accuracy at a low cost, and to produce a high strength press formed part excellent in impact absorptivity. ;SOLUTION: This steel sheet excellent in impact absorptivity after nitriding treatment has a composition consisting of, by weight, ≤0.003% C, ≤0.05% Si, 0.1-1% Mn, ≤0.1% p, ≤0.02% S, 0.03-0.06% Sol.Al, 0.0002-0.0015% B, ≤0.003% N, Ti in an amount in the range where the value of Ti* defined by Ti*%=Ti%-48/14×N%-48/12×C%-48/32×S% becomes -0.01 to 0.075%, and the balance Fe with inevitable impurities.;COPYRIGHT: (C)1999,JPO